I have a 2013 front unit from a 2015 S that was under water for a few days

I have dissembled the unit to find very little water in the gear case but I did find some water in the inverter case . The car was never powered up and when I inspected the logic board I did not find any corrosion. I did try to inspect underneath the high power side with very little luck. Have you Found a way to remove the IGBT board for inspection without damaging it ? With that said , Is there a way to test the inverter assembly before I hook up the high power and let the magic smoke out
